BZ #1084229 - Add support for configuring SSL for RabbitMQ

https://bugzilla.redhat.com/show_bug.cgi?id=1084229

Pass the value of $ssl as rabbit_use_ssl to the nova and cinder
services

This relies on o-p-m pulling in fixes for puppet-ceilometer and puppet-neutron to drop the requirement for kombu certificates when SSL in rabbit is enabled. See BZ for blocking bugs.
$ssl is set globally: $quickstack::params::ssl

And correct, right now it is an on/off knob, no per-service configuration. I didn't want to set the precedent for that when we (hopefully) add secure endpoint support. Doing so eventually should be fairly straightforward as it would just be additional arguments into the class, it just has the potential to make things rather confusing.